stramm
tight
Firm, close-fitting, or pulled taut. Similar to 'straff' (taut), it is used for clothing, ropes, or a snug fit.
Die neuen Schuhe sitzen anfangs noch etwas stramm.
The new shoes are still a bit tight at first.

tight / upright
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tight
Firm, close-fitting, or pulled taut. Similar to 'straff' (taut), it is used for clothing, ropes, or a snug fit.
Die neuen Schuhe sitzen anfangs noch etwas stramm.
The new shoes are still a bit tight at first.

In the meaning of 'fest' (firm) or 'eng' (tight), 'stramm' is often combined with the verbs 'sitzen' (to fit/sit, for clothing) or 'ziehen' (to pull) and 'spannen' (to tighten/stretch, for ropes or muscles).
Das Seil muss stramm gespannt sein, damit die Wäsche nicht durchhängt.
The rope must be pulled taut so the laundry doesn't sag.
The combination 'stramm stehen' is a fixed expression that describes a disciplined, upright posture, as is common in the military.
Die Kinder standen zum Spaß vor ihren Eltern stramm.
The children stood at attention in front of their parents for fun.
In the meaning of 'kräftig und gesund' (strong and healthy), 'stramm' is used almost exclusively for babies or young men, often in the combinations 'ein strammes Baby' (a sturdy baby) or 'ein strammer Bursche' (a sturdy lad).
Alle bewunderten das gesunde, stramme Baby.
Everyone admired the healthy, sturdy baby.
The meaning of 'beachtlich' (considerable) or 'anstrengend' (demanding) is colloquial. It is often used for prices, achievements, or schedules that are challenging.
Wir haben heute ein strammes Programm vor uns.
We have a tough program ahead of us today.
strong
'stark' and 'stramm' can both express that someone or something is strong or requires a lot of effort. 'Stark' is the more general word: it works for physical strength, severe pain, heavy rain, or strong feelings. 'Stramm' is more specific. It often describes a sturdy, healthy body or, colloquially, something considerable and demanding, for example 'ein strammes Programm' (a demanding schedule). For normal strength or intensity, 'stark' is usually more natural. 'Stramm' sounds more tied to particular situations.

Für den Ausflug haben wir morgen ein strammes Programm geplant.
We have planned a demanding schedule for tomorrow's trip.
Nach dem Training fühlt sich Max stärker als früher.
After the training, Max feels stronger than before.